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File:Vintage Texas Instruments Model TI-2550-II Pocket LED Calculator, Original Price - 49.95 USD, Made in the USA, Circa 1975 (9302715246).jpg - Wikimedia Commons
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File:Vintage Sears Pocket Calculator, Model 728.58850, Red LED, Made in USA, Price Was $98.95 in 1973 (8731561333).jpg - Wikimedia Commons
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